42 FOSSIL CIRRIPEDIA. 



enlargement of the fixed scutum and terguni, is due to the development of a single small 

 portion in each valve, namely, the lower ridge of the articular ridges by which these 

 valves are united together. It is very remarkable that in all the species it seems to be a 

 matter of chance, whether the right or left hand valves undergo this singular modification ; 

 consequently, of every valve it is equally likely to find a right-hand or left-hand specimen ; 

 and these, though exactly alike, except in being reversed, or in coming from opposite sides 

 of the body, yet, from this very circumstance, and from the fixed valves being of very 

 irregular shapes, are rather perplexing to identify. This short description will, I hope, 

 suffice to make the following descriptions intelligible. 



1 . Verruca Stromia. Tab. II, fig. 9 a, 9 b. 



Lepas Stromia. O. Mailer. Zoolog. Dan. Prod., No. 3025, 1776. 



— — lb. Zoolog. Dan., vol. iii, Tab. 94, 1789. 



— striata. Pennant. British Zoology, vol. iv, Tab. 38, fig. 7, 1777. 



Die warzenformige meereichel. Spengler. Schriften der Berlin. Gesell., 1 B., 



Tab. 5, fig. 1—3, 1780. 

 Lepas verruca. Spengler. Skrifter af Naturhist. Selskabet, 1 B., 1790. 



— — et Stromia. Gmelin. Syst. Nat., 1789. 



Balanus veruca. Bruguiere. Encyclop. Meth., 1789; Clisia verrucosa, Deshayes, in 

 Tab. 

 — intertextus. Pulteney. Catalogue of Shells of Dorsetshire, 1799. 

 Lepas striatus. Montagu. Test. Brit., 1803. 



— verruca. Wood's General Conchology, PI. 9, fig. 5, 1815. 

 Verruca Stromii. Schumacher. Essai d'un Nouveau Syst. Class., 1817. 

 Creusia Stromia et verruca. Lamarck. Animaux sans Vertebres, 1818. 

 Ochthosia Stroemia. Ransani. Memoire di Storia Nat., 1820. 

 Clisia striata. Leach. Encyclop. Brit. Suppl., vol. iii (sine descript.), 1824. 

 Clitia verruca. G. B. Sowerby. Genera of Recent and Fossil Shells, Plate. 

 Verruca Stromii. J.E. Gray. Annals of Philosophy (new series), vol. x, Aug. 1825. 



V. scuto mobili, crista articulari inferiore dimidiam brevis crista articularis superioris 

 latitudinem non aquante : testa plerumque longitudinaliter sulcata. 



Moveable scutum, with the lower articular ridge not half as broad as the short upper 

 articular ridge : shell generally ribbed longitudinally. 



Fossil in Glacial deposits of Scotland, Mus. Lyell ; Red Crag (Walton, Essex), Coralline Crag (Sutton), 

 Mus. S. V. Wood. 



Recent on the shores of Great Britain and Ireland ; Shetland Islands ; Denmark ; Iceland ; shores 

 of northern Europe ; Red Sea. Attached to shells, laminarise, rocks, crabs, and floating bark, from low 

 tidal mark .to fifty or ninety fathoms. 



I have seen a perfect specimen of this species from the Glacial deposits of Scotland, and 



